Fig. 2.

Expression levels of SpUSP in tomato leaves under phytohormones and different stress conditions. The leaves of 2-month-old plants were used for RNA extraction in LA716 (Solanum pennellii) after treatment with 100 μM ABA, 100 μM GA, and 100 μM ETH, drought, 200mM NaCl, wounding, 100 μM paraquat, 4 °C cold, 40 °C heat, respectively. All samples were collected at the indicated time points (‘h’ and ‘m’ refer to hours and minutes after treatment, respectively) from three biological replicates. Single (*P <0.05) and double (**P <0.01) asterisks denote statistically significant differences between the stress treatment and the 0h control. The β-actin gene (BT013524) was used as an internal control in the qRT-PCR.